The kinetic energy of an electron in the ground state of a $Be^{3+}$ ion is given by:

  • A
    $3e^2 / 4\pi\varepsilon_0 r$
  • B
    $e^2 / 2\pi\varepsilon_0 r$
  • C
    $4e^2 / 3\pi\varepsilon_0 r$
  • D
    $e^2 / 3\pi\varepsilon_0 r$

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